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| Titel |
High concentrations of coarse particles emitted from a cattle feeding operation |
| VerfasserIn |
N. Hiranuma, S. D. Brooks, J. Gramann, B. W. Auvermann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 16 ; Nr. 11, no. 16 (2011-08-30), S.8809-8823 |
| Datensatznummer |
250010038
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| Publikation (Nr.) |
 copernicus.org/acp-11-8809-2011.pdf |
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| Zusammenfassung |
| Housing roughly 10 million head of cattle in the United States alone, open
air cattle feedlots represent a significant but poorly constrained source of
atmospheric particles. Here we present a comprehensive characterization of
physical and chemical properties of particles emitted from a large
representative cattle feedlot in the Southwest United States. In the summer
of 2008, measurements and samplings were conducted at the upwind and
downwind edges of the facility. A series of far-field measurements and
samplings was also conducted 3.5 km north of the facility. Two instruments,
a GRIMM Sequential Mobility Particle Sizer (SMPS) and a GRIMM Portable
Aerosol Spectrometer (PAS), were used to measure particle size distributions
over the range of 0.01 to 25 μm diameter. Raman microspectroscopy was
used to determine the chemical composition of particles on a single particle
basis. Volume size distributions of dust were dominated by coarse mode
particles. Twenty-four hour averaged concentrations of PM10
(particulate matter with a diameter of 10 μm or less) were as high as
1200 μg m−3 during the campaign. The primary constituents of the
particulate matter were carbonaceous materials, such as humic acid, water
soluble organics, and less soluble fatty acids, including stearic acid and
tristearin. A significant fraction of the organic particles was present in
internal mixtures with salts. Basic characteristics such as size
distribution and composition of agricultural aerosols were found to be
different than the properties of those found in urban and semi-urban
aerosols. Failing to account for such differences may lead to errors in
estimates of aerosol effects on local air quality, visibility, and public
health. |
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